The manage widgets layout is where you can modify the widget section on the Application Page(s) view.
Each Application Page has it's own Manage Widgets section.
Configure the Widgets
Select Manage Widgets
After selecting Manage Widgets you will have a list of Available Widgets which can be dragged and dropped into the Active Widgets section. (*Note: Clicking the help icon in the Available Widgets section will show a description of each Widget)
The Active Widgets section will be the current Widgets that are showing in the Home Page View.
After dragging a Widget you want to show in the Application page select save.
There will also be options to edit the current Widget and or remove it from the section.
After saving if you go back to the Application Page View and click Preview you will be able to see the Widget that you have added.